Fluid pressure system



Oct. 5, 1943. R. M. NARDONE FLUID PRESSURE SYSTEM Filed Dec. 20, 1940 7 RonzeoM/Vwdaw.

Patentedoct. 5, 1943 pauses a phiretlity of eetiiat'ed motrs adapted to be" sup lied' WitIi'fiii-ic} inder pressure An object of the'inv efition is to provide novel control; ineans for selec way; phhnetti the several motors either iridivi'cih'ially'l or in groups with the some'e offfiilid upp-1y. Y

furtherobject is to provide fiuitf ciis'ti'ibuting means of novel construction and particularly in vowing the housing" of a p'liir'a'lity of fvalvef units m 3; single unitary struotlii ebf coriipact dimensions'ahd. reIatiVeIysinipIe design.

' Another object of theinventiori i s to nr o vide n'ovfeLmeans for settling such a valve mechanism to minin xizethe possibility of leakage therefrom.

A further object is to provide automatic alve "meghhhisht for permitting al div ersion ofthe fluid back to the source aftei the fluid niotor to which the'fiilid has been directed has moved through a predetermined range of movement, and even though the alve ass'oei'gite'dth'ei'ewith rem'ajir'isin the position preyiduslyfseleoted therefor. I These and other objects oi the invention will become apparent from nspections: the foliovtifig shecificatio hen read with reference to the ac; co 501 )anying dr'awiiigjwhef'e'iri, i illustrated the preferred embodiment qr-the'iht' tioh. Itis' to beexpressly ufider'stood, hawever, that the drawingf' s fOl fhE purpose of illiistia tion on1y,'and

is not designed as a definitionlo'f the limits of the invention, reference hemg ad to the appended ei ztims for this urpose.

In the "drawingi t. V Fig.1 is atto'p'plan', v'iw fifaiifiit ofitaining a plurality ofdiiection controlling Valves a'd'inted to'fo'ntrolthe deliveiji qifiuid to ',a, corresponding plurality of motofs to be aetliated in 'accofda'nce witl'ithe' inventionj q v Fig. 2,is a side 01" let'l'ationeil'fiiew o v u'ii'it shown in Fig. 1; l

the unit of Figs. 1 and 2,3116 also s ows diagrammatically the connections lffdir'i the? source or fluid supply to the several uhitsitfp be actuate in the relationship of seiid eo'nr ieotioiisflt'o' valile meohanism whichc'oxitz fol's the flow thereto;

- 4 is another Vie'W'Of the Vallve' inedh'afiisi'n View shown in Fig. 41 J Y the fidwjtfltld to said: u its and t oi I fluid therefroin' being dependent hph the sgtj tings of the individual valigehuifits coii'espon irrg thereto, .7

unit 2'4 is shown m-hr'ec mplttryi t e Referring to said valve element 24 is rotatable m a' tpied cessf the valve'hol'ising and has keyedtheretti an opthereon to? egistry with the or nhthrjdrjthe,

several fmarkings appearing on they ppeg ilfv by means or the handles H, 42 ma 4%, res e tively, said her-gan ttrtesphhamg to thei 32 of valve 24;,There is at coiled cofiiii ssibn' spring; 44 mounted in a pocket in the iowei" section 29 of the valv'ehousing aind adapted to: bear at itsupper end against the; 'in'ner' end of a tces's as iitth'e valve eleme'r'it it to yieidebiy'urge e f of the valve ousin Ports 5t and 52 the: cut through the tapered sufface" of the vttl'v' e1 24' Bit 'distinetric'ally o'pioosite poi n s he'feoii and are s mciehtiy eep so that the ditiIiie'h dle' is iii eitherfeiitrrhe positiofi ('asj reijie sentd by the pli of the le'gezid s' 91115 'zind fdow'n on the upiie'r' Sfirffi de of. the Vet e ing') ther' s a alth stabiishea rb'r fluthe a's'soeiated sx' vo-ffi'otofitd be actiite similar gth established for' fl'h'm flaw f sei'vo-friotort back to the reservoir by Wiy of the single ou tl et port at whic serves an s fou'i" have units 2 22, 232111624 j'iist asthe single i'iiit conduit serves to'rfeed' fluid to ellvili'l'e' units .froin the pump 13-55 Way of the chinfief 63 which extends centrally through the valve Houst A, i. .rofi f tor in shifting the v lve-e em nts zLdz-tthd z's ing to the depth indicated at 64, and has branching therefrom a group of transversely disposed passages 61, 68, 69 and ID, the latter being shown in Fig. 4 as connecting with either the port 52 or the port SI of the valve element 24, depending upon whether the handle 32 is in the up position indicated in Fig. 1, or in the opposite extreme position indicated by the placing of the legend down on the upper surface of the valve housing. The passages 61, 68 and 69 have corresponding communication with the corresponding ports BI, 82, 83, 84, 85 and 86 of the Valve units 2I, 22 and 23, respectively, and there is a corresponding plurality of outlet passages SI, 92, 93 and 94 extending transversely olf the valve housing from the units 2I, 22, 23 and'zll, respectively, for a suflicient distance to establish communication with the vertically extending passages 96, 91, 98 and 99, respectively, the latter passages leading down to the lower section 29 of the valve housing wheretheyregister with transversely extending passages, (such as thatindicated at Hil in Fig. 4) leading to thesingle outlet port BI which is also located'in saidlower section 29 of the valve housing; the fluid passing through said outlet port 6i being delivered back to the reservoir II byway of conduit I02 a'sindicated diagrammatically in Fig. 3..

' In addition to thepacking glands corresponding to the gland shown at 4'! as a sealing means for the valve unit 24, further protection against leakage is provided by the sealing gaskets I05 and I05 interposed between the central section 21 of the valve housing and the upper and lower sections 28 and 29, respectively; the three sections being clamped together by the pressure applied thereto when the assembly screws (such as the one indicated at '58 in Fig. l) are inserted in the various screw receiving holes, of which two are indicated by the reference characters Ifiil and I ID in Fig. 3. In addition to the foregoing sealing means, there are sealing gaskets II I provided between the under surface of each of the valve handles 22, 4I, 42pand 2 13, on the one hand, and

the upper surface of the valve housing on the other, and pressure is applied to these individual gaskets III by the act of tightening the individual screws II2 by which each valve handle is firmly secured against longitudinal displace ment with respect to its associated valve stem.

Referring now to Fig. 5 there isdisclosed therein a construction for the valve unit 22, for example, whereby the said valve may act automatically to divert fluid from the associated propeller brake controlling unit I5 (Fig. 3) whenever the moving element of said unit has reached either extreme position. As shown in Fig. 5, this result is made possible by drilling a hole II6 transversely through the valve element 22 ata point somewhat above the upper limits of the direction controlling ports 83 and 84 of said unit, and i by changing the contour of the element '22 from conical to cylindrical with different diameters, to allow downward movement of the valve unit under the urge of the increasing pressure of the fluid which develops by reason of the continued operation of the pump I3 after the movable element of the propeller brake actuating unit I5 has reached its extreme position of movement, assuming that all other outlets for'fluid from the pump I3 are closed off by reason of the setting of the valve handles II, 43, and 32 in their respective central, or off positions'as indicated in Fig. 1; it being understood that when any of the said valve units are in the off position, all

of mechanism to be actuated, such as landing gear, wing flapsand tail wheels of an airplane, may have neutral or central, as well as extreme positions; while other units such as a propeller brake, for example, have no corresponding central position and move only from an extreme position to an opposite extreme position. Thus with such'an installation as is indicated, it will frequently happen that the three valve units 2|, 23 and 24 will be in the central positions in which all flow therethrough is blocked off while the fourth valve 22, controlling the application of the propeller brake, will be in the position indicated, for example, in Fig. 3 in which there is communication between the inlet passage,68 and the outlet passage I40 leading to the propeller brake applying unit I5 by way of the conduit MI, and also communication back to the reservoir from the opposite side of the unit I5,by way'of the conduit I42, return passage I43,

theport 83 of the valve'22, and the return passages 92 and 91 leading .to the outlet port 6!, and thus back to ther'eservoir byway of conduitl02.

It will be apparent that when the unit I5 is moved to its extreme position corresponding to the setting of the valve 22, as shown in Fig. 3, no more fluid can be accepted by the said unit and accordingly therewill be a pressure build up' in the line I41 and in the passage I40 leadinglthereto, which pressure will be exerted against both the upper and lower faces of the valve port 84; but as the lower face of. the valve port is of greater area than the upper face (due to the different diameters of the valve) the tendency of the valve :Will'bef'to move downward against the yielding opposition" of the spring 44. When'the pressure build-,upjhas continued for a suflicient period to 'producea' downward movement suflicient to expose the transverse passage I16, the fluid will then have an opportunity to pass directly through the valve by way of passage I I 5 and in this manner it will find a return path to the reservoir II byway of thereturn passages'92 and 91 leading to the outlet port 6|. Thus the fluid supply will be'divert'ed'from the servo-motor I5 and allowed to pass'dire'ctly back to the source I I by the automatic action of the valve 22 in-response to the build-up of pressure in the line leading thereto.

A clamp 42a (Fig. 1) may be provided to hold the flange 22b of handle 42 against the sealing gasket 2'II although permitting rotary movement thereof. Such rotary movement will be communicated to valve 22 by reason of the splined connection with the shank 22a of the valve. This splined connection permits relative axial movement between elements 22 and 22b.

' What is claimed is: ,1. A valve mechanism including a plate and a plurality of openings extending through said plate to form valve seats, a valve element rotatable in each jof said openings, each of said valve elements having outlet meansassociated therewith and also a handle for,rotation thereof, means including a passage extending centrally of said plate to feed fluid directly to any selected one of said valve elements when said selected valve ele-' ment is rotated to its fluid feeding position, one

having outlet means associated t erewith and also a handle for rotation thereof, and means including a passage extending centrally of said plate to feed fluid directly to any selected one of said valve elements when said selected valve element is rotated to its fluid feeding position, one

of said valve elements having opposing exposedareas of different sizes, means coacting with said exposed'areas to divert fluid flow from said passage, thereby short-circuiting all of said valves, in response to a rise in, pressure beyond a certain point, and means for preventing such diversion prior to a rise in pressure to said predetermined point. a

ROMEO M. NARDONE. 

